Important: Please note that, although your employer can not specify any documents for your I-9 form, they are required to view your Social Security card regardless of what documents you present for the I-9. This is required to ensure your name and number are correct for tax purposes.
The I-9 form is the form that certifies your identity and confirms your eligibility to work in the United States. You must complete the I-9 form prior to beginning work. You must present documents that verify both your identity and eligibility. Your employer can not require you to present any specific document for I-9 purposes and cannot refuse eligible documents on the list. There are some documents such as a passport that establishes both identity and eligibility. Others such as a Driver License or Ferris ID would satisfy the identity requirement and documents that establish eligibility would include your Social Security card, Birth Certificate etc. See I-9 link for form and a list of all eligible documents. You must provide ORIGINAL documents to the employer to complete the I-9.